I measured the voltage from + battery term to + starter motor; then 
minus battery term to - starter motor, and added.

It's a new lead/acid lawn mower battery. The wires were original and 
getting warm, so I surmise current is probably OK......

Mark

Dr Skip wrote:
> How did you measure the drop? My first guess would be sulphated battery
> not able to provide enough current. I might also try heavy gauge wires
> direct from a known good (or even oversized) battery to motor, both +
> and - .  If still no turn, then it's the motor. If it works that way, go
> huntin' some more.
> -Skip
>
>   
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